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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation [Abstract]  
Summary Of Restricted Stock Activity
A summary of restricted stock and restricted stock unit activity and changes during the year ended December 31, 2017 is presented below:
Restricted Stock and Restricted Stock Units
 
Grants
 
Weighted Average Grant Date Fair Value
 
Aggregate Intrinsic Value ($000)
 
 
 
 
 
 
 
Outstanding at January 1, 2017 (non-vested)
 
1,188,774

 
$
28.87

 
 
Granted (1)
 
1,426,106

 
35.02

 
 
Vesting (transfer/conversion to common stock)
 
(817,601
)
 
30.41

 
 
Forfeited
 
(71,091
)
 
30.20

 
 
Outstanding at December 31, 2017 (non-vested)
 
1,726,188

 
$
33.51

 
$
88,415
Summary Of Performance Share Unit Activity
A summary of performance share unit activity and changes during the year ended December 31, 2017 is presented below:
Performance Share Units
 
Grants
 
 
 
Outstanding at January 1, 2017 (non-vested)
 
703,939

Granted
 
239,964

Vesting and transfer of ownership to recipients
 
(151,599
)
Forfeited
 
(99,643
)
Outstanding at December 31, 2017 (non-vested)
 
692,661